// Copyright (c) 2005, Rodrigo Braz Monteiro
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/// @file ass_export_filter.cpp
/// @brief Baseclass for and management of single export filters
/// @ingroup export
///

#include "config.h"

#include "ass_export_filter.h"

#include "utils.h"

#include <algorithm>
#include <boost/format.hpp>

static FilterList& filters() {
	static FilterList instance;
	return instance;
}

AssExportFilter::AssExportFilter(std::string const& name, std::string const& description, int priority)
: name(name)
, priority(priority)
, description(description)
{
}

void AssExportFilterChain::Register(AssExportFilter *filter) {
	int filter_copy = 1;
	std::string name = filter->name;
	// Find a unique name
	while (GetFilter(name))
		name = str(boost::format("%s (%d)") % filter->name % filter_copy++);

	filter->name = name;

	// Look for place to insert
	auto begin(filters().begin()), end(filters().end());
	while (begin != end && (*begin)->priority >= filter->priority) ++begin;
	filters().insert(begin, filter);
}

void AssExportFilterChain::Unregister(AssExportFilter *filter) {
	auto it = remove(begin(filters()), end(filters()), filter);
	if (it == end(filters()))
		throw wxString::Format("Unregister export filter: name \"%s\" is not registered.", filter->name);

	filters().pop_back();
}


const FilterList *AssExportFilterChain::GetFilterList() {
	return &filters();
}

void AssExportFilterChain::Clear() {
	while (filters().size() > 0) {
		AssExportFilter *f = filters().back();
		delete f;
		if (filters().size() && filters().back() == f)
			filters().pop_back();
	}
}

AssExportFilter *AssExportFilterChain::GetFilter(std::string const& name) {
	for (auto filter : filters()) {
		if (filter->name == name)
			return filter;
	}
	return 0;
}